APT / THREAT GROUP

ELMER

aliases

Last seen:Mar 17, 2026

Intelligence Profile

ELMER is a non-persistent proxy-aware HTTP backdoor written in Delphi, and is capable of performing file uploads and downloads, file execution, and process and directory listings. To retrieve commands, ELMER sends HTTP GET requests to a hard-coded CnC server, and parses the HTTP response packets received from the CnC server for an integer string corresponding to the command that needs to be executed.

Threat Analysis

ELMER is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

External References

→https://attack.mitre.org/groups/G0023

→https://attack.mitre.org/software/S0064

→https://cybergeeks.tech/a-detailed-analysis-of-elmer-backdoor-used-by-apt16/

→https://www.fireeye.com/blog/threat-research/2015/12/the-eps-awakens-part-two.html

→https://www.symantec.com/security-center/writeup/2015-122210-5724-99

Quick Facts

TypeAPT / Threat Group

Aliases3

Also Known As

win.elmerElmostELMER

External Intelligence

Malpedia: win.elmer

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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